Bugfix: PrioritiseTransaction updates the mempool tx counter

The mempool's nTransactionsUpdated is used by getblocktemplate
to trigger new invocations of CreateNewBlock().

src/txmempool.cpp

@@ -865,6 +865,7 @@ void CTxMemPool::PrioritiseTransaction(const uint256& hash, const CAmount& nFeeD
             BOOST_FOREACH(txiter descendantIt, setDescendants) {
                 mapTx.modify(descendantIt, update_ancestor_state(0, nFeeDelta, 0, 0));
             }
+            ++nTransactionsUpdated;
         }
     }
     LogPrintf("PrioritiseTransaction: %s feerate += %s\n", hash.ToString(), FormatMoney(nFeeDelta));

src/txmempool.h

@@ -411,7 +411,7 @@ class CTxMemPool
 {
 private:
     uint32_t nCheckFrequency; //!< Value n means that n times in 2^32 we check.
-    unsigned int nTransactionsUpdated;
+    unsigned int nTransactionsUpdated; //!< Used by getblocktemplate to trigger CreateNewBlock() invocation
     CBlockPolicyEstimator* minerPolicyEstimator;
 
     uint64_t totalTxSize;      //!< sum of all mempool tx's virtual sizes. Differs from serialized tx size since witness data is discounted. Defined in BIP 141.